Ocean Conveyor Belt Confounds Climate Science
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theresilientearth.com ^ | Thu, 04/08/2010 - 14:27 | Submitted by Doug L. Hoffman
Posted on Sun 22 Aug 2010 08:15:56 AM PST by Ernest_at_the_Beach
The Atlantic Meridional Overturning Circulation (AMOC), also known as the “Ocean Conveyor Belt,” has been the subject of much study since its discovery. The AMOC is primarily responsible for Europe's temperate climate and some scientists have warned that global warming could cause the ocean's flow to slow down or even stop. This rather counter intuitive result of a warming climate would result in a much colder Europe—perhaps even a new mini-ice age. A new analysis of data from satellites and drifting sensors finds no evidence that the conveyor belt is slowing. In fact, a NASA backed study indicates that the conveyor is far less susceptible to throttling by climate change than some climate change alarmists feared.
The heat transported by the AMOC makes a substantial contribution to the moderate climate of maritime and continental Europe. Scientists have long feared that any significant slowdown in the overturning circulation would have profound implications for climate change. In a 2005 Nature paper, “Slowing of the Atlantic meridional overturning circulation at 25°N,” Harry L. Bryden, Hannah R. Longworth and Stuart A. Cunningham analyzed temperature and salinity measurements made during five brief ship surveys between 1957 and 2004. These data seemed to indicate that the northward flow of the Atlantic conveyor suffered a 30% decline in volume around the turn of the century. These findings led to warnings that a scenario similar to the disaster film The Day After Tomorrow could be just around the corner.
“'Mini Ice Age' May Be Coming Soon, Sea Study Warns,” was the headline on the National Geographic News site. “Chilling new evidence from the Atlantic Ocean is raising fears that western Europe could soon be gripped by a mini ice age,” reported their 2005 news article. “The study supports computer model predictions suggesting that global warming will switch off the North Atlantic current in the next 50 to 100 years.” But even in 2005, it was noted that the magnitude of these findings did not seem to match up with observed climate variation.